View Compilation Error

0_0_38322779_29141.cpp:13:1: error: expected ';' after class definition
 }
 ^
0_0_38322779_29141.cpp: In member function 'int solution::solu()':
0_0_38322779_29141.cpp:6:32: error: 'scanf' was not declared in this scope
     while(scanf("%d %d\n",&a,&b)!=EOF)
                                ^
0_0_38322779_29141.cpp:6:35: error: 'EOF' was not declared in this scope
     while(scanf("%d %d\n",&a,&b)!=EOF)
                                   ^
0_0_38322779_29141.cpp:8:22: error: 'printf' was not declared in this scope
     printf("%d\n",a+b);
                      ^